diff --git a/pre-inst-guile-env.in b/pre-inst-guile-env.in
index 5bf1e136a..671376feb 100644
--- a/pre-inst-guile-env.in
+++ b/pre-inst-guile-env.in
@@ -78,4 +78,8 @@ PATH="${top_builddir}/guile-config:${PATH}"
 PATH="${top_builddir}/libguile:${PATH}"
 export PATH
 
+# set GUILE (clobber)
+GUILE=${top_builddir}/libguile/guile@EXEEXT@
+export GUILE
+
 exec "$@"
diff --git a/pre-inst-guile.in b/pre-inst-guile.in
index 01f4f2531..d67f26168 100644
--- a/pre-inst-guile.in
+++ b/pre-inst-guile.in
@@ -87,7 +87,7 @@ DYLD_LIBRARY_PATH="${dyld_prefix}${top_builddir}/libguile/.libs:$DYLD_LIBRARY_PA
 export DYLD_LIBRARY_PATH
 
 # set GUILE (clobber)
-GUILE=${top_builddir}/libguile/guile
+GUILE=${top_builddir}/libguile/guile@EXEEXT@
 export GUILE
 
 # do it